/* Estilos de estructura, cabecera y disposición responsiva */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Barra Superior / Cabecera */
.header-bar {
  background: var(--bg-card-glass);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1.5rem;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.logo-icon {
  font-size: 1.6rem;
}

/* Conmutador de Perfil (Padre / Hijo) */
.role-switch-wrapper {
  display: flex;
  background: #e2e8f0;
  padding: 0.25rem;
  border-radius: var(--radius-full);
  gap: 0.25rem;
}

.role-btn {
  border: none;
  background: transparent;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.role-btn.active {
  background: var(--bg-card);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Contenedor Principal */
.main-content {
  max-width: 1200px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1.25rem;
  flex: 1;
}

/* Barra de Filtros por Materia */
.subjects-filter-bar {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.subject-chip {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.subject-chip:hover {
  border-color: var(--color-primary);
}

.subject-chip.active {
  background: var(--color-primary);
  color: var(--text-inverse);
  border-color: var(--color-primary);
}

/* Toast de Notificaciones */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast-msg {
  padding: 0.8rem 1.2rem;
  background: #1e293b;
  color: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    align-items: stretch;
  }
  .role-switch-wrapper {
    justify-content: center;
  }
}